Added TrainingRecordService

FabApprovalWorkerServiceTests/UserServiceTests.cs

@@ -61,6 +61,11 @@ public class UserServiceTests {
         Assert.True(users.Count() == 2);
     }
 
+    [Test]
+    public void UpdateUserCertificateDataWithNullListShouldThrowException() {
+        Assert.ThrowsAsync<ArgumentNullException>(async () => await _userService.UpdateUserCertificationData(null));
+    }
+
     [Test]
     public async Task UpdateUserCertificationDataShouldReturnTrue() {
         bool result = await _userService.UpdateUserCertificationData(MOCK_USERS.ToList());